1. False-positive amniotic fluid acetylcholinesterase analysis in the third trimester.
- Author
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Suchy SF and Yeager MT
- Subjects
- Abdominal Muscles abnormalities, Diagnosis, Differential, Evaluation Studies as Topic, False Positive Reactions, Female, Fetal Growth Retardation diagnosis, Humans, Hydrocephalus diagnosis, Hydrocephalus diagnostic imaging, Neural Tube Defects diagnostic imaging, Polyhydramnios diagnosis, Polyhydramnios diagnostic imaging, Pregnancy, Pregnancy Trimester, Third, Prenatal Diagnosis, Ultrasonography, Acetylcholinesterase analysis, Amniotic Fluid chemistry, Neural Tube Defects diagnosis
- Abstract
Thirty-two third-trimester amniotic fluid samples were studied according to the indication for amniocentesis, result of acetylcholinesterase (AChE) analysis, and outcome, in order to address the issue of the effectiveness of AChE testing late in gestation. The results indicate that third-trimester AChE analysis is less effective than second trimester in distinguishing open neural tube defects (ONTDs) and ventral wall defects (VWDs) from other abnormalities. False-positive results occurred in cases of isolated hydrocephaly (four of seven cases), polyhydramnios, and intrauterine growth retardation (IUGR). Caution is recommended in interpreting third-trimester AChE tests, particularly when neither an ONTD nor a VWD is observed by ultrasound.
- Published
- 1993
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